Body mass index and mortality from ischaemic heart disease in a lean population: 10 year prospective study of 220,000 adult men. - Chen, Z; Yang, G; Zhou, M; Smith, M; Offer, A; Ma, J; Wang, L; Pan, H; Whitlock, G; Collins, R; Niu, S; Peto, R (International journal of epidemiology, 2006)